Q74. For the function $f ( x ) = \sin x + 3 x - \frac { 2 } { \pi } \left( x ^ { 2 } + x \right)$, where $x \in \left[ 0 , \frac { \pi } { 2 } \right]$, consider the following two statements : (I) f is increasing in ( $0 , \frac { \pi } { 2 }$ ). (II) $f ^ { \prime }$ is decreasing in ( $0 , \frac { \pi } { 2 }$ ).
Between the above two statements,\\
(1) only (II) is true.\\
(2) only (I) is true.\\
(3) neither (I) nor (II) is true.\\
(4) both (I) and (II) are true